If you love to doodle, then this hack is for you. In order to draw details, you need to change your settings.
For iOS, go to settings and select general. Tap on accessibility and under vision select enable zoom. Then, select show controller and choose your zoom region preference. Also, make sure you have your maximum zoom set to 15x.
For Android, go to settings and select accessibility. Tap on vision and tap on magnification gestures. Then, select enable zoom.